Method of molding cored articles



c. J. Kol-ILER 2,132,739

METHODOF MOLDING CORED ARTICLES` Fild Nov. ze, 1957 INVE R HEL Ifo/af@ATTORNEY Patented Oct. 11, 1938 UNITED STATES PATENT OFFICE 2 Claims.

Mly invention relates to improvements in a process of molding coredarticles.

It has hitherto been common practice in molding such articles to setcore supporting chapletsY on the pattern and to ram the sand of the moldaround them, thus incorporating the chaplet in the mold with a portionprotruding therefrom. This not only requires considerable time and careto set the chaplets properly and to prevent them from becoming dislodgedor misplaced during the molding operation and the subsequent handling ofthe mold, but leaves a portion of the chaplet protruding from thecasting, thus requiring an extra operation for the removal of thisprotruding portion.

It is the object of this invention to obviate the above-mentioneddiiculties by providing a method of molding wherein the chaplet is notincorporated in the mold and does not protrude from the nished casting.

With these and related objects in View the invention consists in theprocess disclosed herein and illustrated in the accompanying drawing, in

which Figure 1 is a sectional view of a mold constructed in accordancewith the invention; Figure 2, a longitudinal sectional View of the core,taken along the line 2-2 of Figure l; and Figure 3, a transversesectional View of the core and chaplet, taken along the lines 3-3 ofFigure 2.

The invention is herein illustrated and described with particularreference to its use in connection with the molding of a radiatorsection; however, it is by no means limited to such use, and itsadaptation to the molding of other articles will be app-arent to thoseskilled in the art.

In the performance of the` process the mold is made in a plurality ofsections, preferably two, a cope l and a drag 2, adapted to be joined toform the mold and enclosed in the flask `3. The mold is formed with themold cavity 4, in the form of the article to be molded, by ramming orpacking the molding sand around a suitable pattern (not shown). Thisoperation may be performed manually or by the use of various types ofmolding machinery and the pattern may be an integral pattern, matchplateor other of the conventional types of patterns, as desired.

Since the lcasting must be provided with a hollow center portion topermit the passage of fluid therethrough, a core 5 is utilized. The core5 is spaced above the lower portion of the mold cavity 4 by any suitablemeans, such as the spacing cores 6 (shown in dotted lines in Figure 1)which also ac t to form the header of the radiator section.

The core 5 is preferably formed with longitudinally extending vents 1 toallow the escape of gas during the casting operation and is also formedwith longitudinally extending slots 8 which are relatively long andnarrow in comparison to their depth. These slots are formed in the coreduring thel formation thereof. The core is then baked in the usualmanner to harden it. The slots 8 are designed to receive chaplets 9which are formed to t therein with a portion protruding therefrom. Thechaplet 9 is preferably formed by bending a wire into a substantiallyparallelogrammic shape. However, the chaplet may, if desired, be vformedof other material or of a different configuration.

As will be seen from the illustration, the chaple 9 rests upon thebottom oi the slot 8 and protrudes from the slot a distance equivalentto the desired space between the core and the Wall of the mold cavity 4and thus engages the wall of said mold cavity and prevents the core fromrising or floating when the molten metal is poured in the mold.

When the mold is cast the'molten metal ows into the slot 8 and aroundthe chaplet 9, fusing it and welding it rmly into the casting to formanintegral part thereof. No portion of the chaplet protrudes from theexterior of the casting, and the interior n formed by the metal enteringthe slot 8 is unobjectionable.

The chaplet may be placed in the core after it has been positioned inthe mold and just prior to closing the mold, hence no special care isrequired to prevent it from becoming misplaced or dislodged. Theoperation of placing the chaplet is a simple one, requiring no specialskill or care.

t will be obvious that numerous changes may be made in the specicdetails disclosed herein; therefore, I do not limit myself to saiddetails but claim all processes within the spirit of the invention andthe scope of the appended claims.

I claim:

1. In molding methods wherein a mold containing a mold cavity is formedin a plurality of sections; a core inserted in said mold cavity; themold closed and molten metal poured into said mold cavity and aroundsaid core to form a casting; that improvement which comprises forming aslot, relatively long and narrow in comparison to its depth, in the coreduring the formation thereof; baking said core; forming a chaplet bybending a Wire into a parallelogrammic shape and positioning saidchaplet in the slot in said core prior to closing the mold with aportion oi said chaplet protruding beyond the surface of said core andadapted to engage the wall of said mold cavity.

.2. In molding methods wherein a mold containing a mold cavity is formedin a plurality of sections; a core inserted in said mold cavity; themold closed and molten metal poured into said mold cavity and aroundsaid core to form a casting; that improvement which comprises forming aslot in the core during the formation thereof; baking said core andpositioning a chaplet in said slot prior to closing the mold with aportion of said chaplet extending beyond the surface of said core andadapted to abut the Wall of said 5

